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Finding the Fourth Proportional to 621.72, 857.80 and 359.70

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Solution

The fourth proportional to 621.72, 857.80 and 359.70 is: 496.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.72 : 857.80 = 359.70 : x
  2. Step 2: Convert to fraction form
    621.72/857.80 = 359.70/x
  3. Step 3: Cross multiply
    621.72x = 857.80 × 359.70
  4. Step 4: Simplify right side
    621.72x = 308,550.66
  5. Step 5: Solve for x
    x = 308,550.66/621.72
  6. Step 6: Final answer
    x = 496.29

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.